section{
	width: 1250px;
	margin: 0 auto;
	color: black;
}
#shangmian{
	width:  100%;
	height: 100px;
	background: #ddd;
	margin: 0 auto;	
}
#chang{
	width: 1250px;
	height: 150px;
	background: #ddd;
	margin-top: 10px;
	position: relative;
}
#box1{
	width: 300px;
	height: 100px;
	background: #ddd;
	margin-top: 10px;
	margin-left: 10px;
	float: left;
}
#box2{
		width: 300px;
	height: 300px;
	background: #ddd;
	margin-top: 10px;
	margin-left: 10px;
	float: left;
}
#xiamian{
		width:  100%;
	height: 100px;
	background: #ddd;
	margin: 0 auto;	
	margin-top: 430px;
}
